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Viability and vigour loss during storage of Rudbeckia mollis seeds having different mass: an intra-specific perspective

Published online by Cambridge University Press:  10 July 2020

Nicholas G. Genna ,
Christina Walters  and
Héctor E. Pérez
Nicholas G. Genna*
Affiliation:
Department of Environmental Horticulture, Plant Restoration and Conservation Horticulture Research Consortium, University of Florida, Gainesville, FL32611-0675, USA
Christina Walters
Affiliation:
United States Department of Agriculture – Agricultural Research Service, National Laboratory for Genetic Resources Preservation, 1111 S. Mason St., Ft. Collins, CO80521-4500, USA
Héctor E. Pérez
Affiliation:
Department of Environmental Horticulture, Plant Restoration and Conservation Horticulture Research Consortium, University of Florida, Gainesville, FL32611-0675, USA
*
Author for correspondence: Nicholas G. Genna, E-mail: nicholas.genna@oregonstate.edu
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Abstract

Recent evidence points to relationships between intra-specific seed mass variation and viability loss in response to ageing stress. However, little is known about how seed quality may change temporally in response to such stress. Here we examined seed–water relations of mass-separated Rudbeckia mollis seeds to better understand physiological status among mass classes. We then evaluated seed viability and vigour changes in response to various storage conditions or post-storage vigour tests (a 41°C, 75% RH stress for up to 45 d). We found similar pre-storage physiology among mass classes. However, seeds of lower mass deteriorated up to 1.5-fold faster than heavier seeds under certain conditions. Stressing seeds after storage resulted in distinct vigour differences among mass classes. For example, vigour in lower mass seeds tended to decline more compared to heavier seeds following storage in a climate-controlled room. Alternatively, vigour loss varied among mass classes following storage in a non-climate-controlled shed. Our results highlight the importance of distinguishing between pre-sowing storage and post-storage vigour effects when quantifying relative levels of viability loss among seeds of different mass. Furthermore, differential responses to storage and ageing stress among mass classes may have important implications for post-storage regeneration and subsequent population dynamics.

Keywords

ageingdeteriorationintra-specific variationrelative stress toleranceseed massseed–water relationsvigour stress test
Type
Research Paper
Information
Seed Science Research , Volume 30 , Issue 2 , June 2020 , pp. 122 - 132
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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Footnotes

†

Current address: Oregon State University, Columbia Basin Agricultural Research Centre, Adams, OR 97810, USA.

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